TCL王牌大屏幕彩电故障检修实例(上)

TCL?????ó?????????????ì??????(??) ??1.???????ó??TCL????2968L????????°é?????????ù??????·??????ì??????°é????·?IC601(TDA2616)??7??????????·???????32V???????????÷??×èR601×ó????32V??????????????R601(1??/2W)?ì?é?????·??????TDA2616??7?????·??×è??·??????????????·????????????·??éIC604???·??????TDA2616?ó????×°??R601?????ò??±í5V?±?÷???÷????????R601?????????ú·????????÷·????ó?????????ú?ì?é?????????????ù?÷???????·?????????í???????????????ù?÷?°R601?ó???ú?÷?????????????? ??2.???????ó??TCL????9228?????????
ú?°?????±???????????????????? ·??????ì??????BR901??????300V?????????????÷??????????0V???é???à??×èR914???·??·???C913???????????????????????ì?é?????·????C913?÷?????·?????? ???í????????????????×è???????ü???????? ??3.???????ó??TCL????9228?????????¤???????????????¤???????????÷???????????? ·??????ì???????????????÷????CN904??1????90??120V??????????????????145V???ì?é·???C926?????????????????????ó???÷?????????????¨??90V?????±???¤???????????????????????÷??????????????40W°×????×÷???
????????÷????????????70V×ó?????¤?÷????????????????·?????BR901???÷????300V???????????ì?é????????????????D905??R914??R918??????????????C926???????éC926?????·?????? ???í???????ü??C926?ó???ú?÷?????????????? ??4.???????ó??TCL????9228???????????????????????????? ·??????ì?????????¨?÷???ìIC302(TDA4555)??{15}??????????TP303???????????????¨????????????1????3????(B??Y)??(R??Y)???????????????ì?é?á×????¨???·DLT302???????±???¨???????·Q304??X302?ù?????????ìIC302??{24}????±¤?????¨???????????????????????????????ú??±¤??????????IC102??{27}??????????R320?±??????IC302????{24}???????????¨?????·IC102?????????? ???í???????ü??IC102?ó???ú?÷?????????????? ??5.???????ó??TCL????9228?????????¤????????????????°é???????? ·??????ì?????????í?÷IC601(PCA84C440)?????°×??????÷?±?????ó?????????±IC102(TDA8305A)????{22}??????????????????????????Q603?????ú???ó????IC601??{29}????IC601????????????±????????ó????????????1???????··??????÷???????????????÷???????¨?÷???ìIC102??{29}????????????????????????IC102??{22}?????????????¨?????????éQ603??R151??C135??·???Q603?ù??????????????????Q603?§?§??IC601??{29}??????±??????????????????? ???í???????ü??Q603?ó???ú?÷?????????????? ??6.???????ó??TCL????9229?????????ú?????? ·??????ì?????é???¤IC901??????12V??20V???????????÷???????ó???????ú???????????é??C923(333?F)???????·?¨C923(333?F)?????????????? ???í???????????????????ü???ó???ú?÷?????????????? ??7.???????ó??TCL????9229?????????¨?????? ·??????ì????±??ú????·??????ú?
????ì???°???¨?±?????ó????????1.?±?÷?÷??????VT??????2.?????·??????3.×????????ú×?AFT???·???????ò????????AFT?????????????????÷???÷??????±??????????????¨?á???ó??????°é???????±?????????·VT???÷?????????????¨?????????à·??ó?÷Q601??????????±?????VT???à????????Q601???ù????????????????·ù?????????????????í?÷IC601??1??????100k???????÷????????5V?????????????????????·????×èR612?????????÷?÷????????·????????±????°é???????ó???????°???¨?±???ó???ù?????í?????í???é?????????????????í?÷?òAFT???·?????????÷????????°é??????IC102??{22}????????AFT????????°????÷?????ü??AFT??????6.2V????2V????IC601??1????????????9??AFT???????ó??2.4V????????2.4V??×????ù??????·??ò±????????????¨??9????????AFT±??????·????????IC601??1???????í?ó???÷???????????¨?????í?÷9??AFT?????????????? ???í???????ü???????í?÷?????é?ó???ú?÷?????????????? ??8.???????ó??TCL????9328???????????ú????????????2·????ó?????????°S?±???¤?ú??????·??????ì??????????·??????????é143V?????????¨????120??130V????±??????é?????¨????C926±????????????í???????ü??C926?ó???ú?÷????????????????9.???????ó??TCL????9328????????·ù????????°??????¤??????·??????ì???????ú?ì?é??????????·???????5V????????????????143V????????????90V???é?????¨????C926?????????????????í???????ü??C926?ó???ú?÷??????????????
??10.???????ó??TCL????9328???????????¤????????????????????°é????????·??????ì???????????????????ì???????ú?????????÷??????PCA84A440???é???????¤×÷???????ù±???????{42}????5V??????????????{33}???ù?????????·D607??R635??C615??C619?????????ü???§??X601(10MHz)????????????????IC601???????ü???ó?????????????????¤?÷?????????????????????é??·???·????·?????????íIC302(TDA4555)??{13}????B??????????????4.5V??????????12V????????????????±????÷T402??7????????????D404???÷??C429???¨?ó??ZD402???????????é??ZD402???????·?????????í???????ü??ZD402?ó???ú?÷????????????????11.???????ó??TCL????9328?????????ú??·ù????????°??????¤??????????????????????????????????·??????ì?????ì?é??????????·?????????????????5V????????143V????????????90V??·??????????????ò???·???é?????¨????C926?????????????????í???????ü??C926?ó???ú?÷????????????????12.???????ó??TCL????9328?????????ú??????????°é??×ó?ù?????????????ù?????á??????·??????ì????????·??????éIC201?÷????????×è??·?????????1????????×è????6????????×è???é????·??é???§????????C201?????????????í????????47?F/16V?????ü???ó???ú?÷????????????????13.???????ó??TCL????9328??????????????????×ó???ù???ù???ù??????·??????ì???????ú°é?????·????·??éIC102(TDA8350A)??°é??????????×????éIC101(TA8710S)??TV/AV×????éIC001(TA8628N)????·??éIC201(LA4445)?°???§???·×é????IC001??2???????????????????????????í?÷IC601??{25}???????????±?¨??Q305????????????????????????????°é???????±??IC001??2????????????????±??ì?é??IC001??{11}??????????????????????IC601??2?????ü??????°é???????±???????????ó°é???????????í????IC601??2?????±???????¨????×÷?????±IC102??2???????¨??±???????Q603????IC601??{22}???±??IC601??2??±??á?ó??????????°??????ü????±????????????÷?¨?ù??°é????????IC601??2??°é????????????°é?????·×??í????????×??????¨??·?????????????
???????????????¨???¨??±????·??Q603?????????????í???????ü??Q603?ó???ú?÷????????????????14.???????ó??TCL????9328????????????±?????±?°??????????????ó??????·??????ì?????é????????·??????±???????????????????????é??C424?????§?§?????????í???????ü??C424(10?F/250V)?????ó???ú?÷????????????????15.???????ó??TCL????9328??????????????????????????????·??????ì?????ì????±??????·??????????ABL???·???????é???????????????????????ù?????·???????????°IC304(TDA3504)???§???????é??D305???????§?§?????????í???????ü??D305???????ó???ú?÷????????????????16.???????ó??TCL????9328???????????¤???????¨??????·??????ì????°??????ü??×?·??????????????????ú???????÷?????í??·??????????é????±¤???????·?????±????????±¤????????????1.5V???????±??????1.0V????????±¤???????·????C434???????????¨???é??C416?????§?§?????????í???????ü??C416?ó???ú?÷????????????????17.???????ó??TCL????9328???????????ù????????·??????ì?????é????°???°é????·????????????????????????????í?÷IC601??2??°é????????????°é????×??????¨????×÷????·????????ù?????é????IC102(TDA8305)?à??°é?????·??·???{22}???????????????é??C135????±????????????í???????ü??C135?ó???ú?÷????????????????18.???????ó??TCL????9328???????????í???§????????·??????ì???????é?????????·??????????·???????????R429??×è??????????????L402??????????????????????×è???????·???éL402?????????é?????????????????????????í?????????????????????????ó???ú?÷????????????????19.???????ó??TCL????9328???????????????ù????????????????????????????·??????ì?????????????ù±?????????????????×??????????·????????Q402??c??????710Vp??p??·???????(????????900Vp??p)??±í?÷???????????????????÷Q402????????±????÷T402?°?????§???????????é???????????·T402????????????C416?????
????????í???????ü????????C416?ó???ú?÷????????????????20.???????ó??TCL????9328?????????ú°????±×ó??????????·ù??????????·??????ì???????÷???í???÷???????÷???????????ó??±???????????±????÷T402??1??2????????????????????????(????????900Vp??p)???ì?éT402??2??????????????C417?????????÷????????D402??c??(???±??T402??2???à??)????D402??C414?°C430???????ì?é·???C414??C430??????????????±????????????í???????ü????????C414??C430?????ó???ú?÷????????????????21.???????ó??TCL????9328????????????·?????????±????¤??????×ó±????¤??????????·??????ì?????ù?????????ó???????ì?é??·????????????·??????·???c??????±?????????30V×ó?????é??????±????÷??3????????·????÷??D405?????¨?????÷C424??·???C424????±????????????í????????10?F/250V?????÷?ü??C424?ó???ú?÷????????????????22.???????ó??TCL????9328???????????¤????°é??????????????????????·??????ì???????
????÷??????310V????Q909??b??e??????0.3V?????÷???ú?ó??????????????????????????°???CN904???????????·???????????????¤×÷????145V????????????×è?????????????????·???é??C914?÷?????·?????????í???????ü??C914?ó???ú?÷????????????????23.???????ó??TCL????9329???????????¤????°é????????·??????ì???????ú????×?????LX??????×????????????????×???????????????±?????ü?????????????¨?è??????×÷??????????????·??ò????±?????????????????×?????????·??ò?????????????????¤??°??????????????¨?è???·?????????????ì?é????×????????????????é??LX?????????????í???????ü??LX?ó???ú?÷????????????????24.???????ó??TCL????9329?????????¤??°?????????·??????ì?????????í?????·?????????÷??VR402????×÷????VR402????????????Q401??Q405???????×???¨·ù?????ó???????÷???í???????????????ó?±????·ù???¤????°????????????????±?????¤????·ù????????VR402?÷?????ó?????????????????ü??VR402?????????÷?????????????????¨?????÷VR402?????????????í???????ü????????VR402?ó???ú?÷????????????????25.???????ó??TCL????9329????????
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